re-introduce CI caching

Author: tylerbarker

.github/workflows/ci.yml

@@ -89,6 +89,24 @@ jobs:
             -S localhost -U sa -P 'SqlKit123!' -C \
             -Q "CREATE DATABASE sql_kit_test"
 
+      - name: Restore dependencies cache
+        uses: actions/cache@v4
+        with:
+          path: |
+            deps
+            _build
+          key: ${{ runner.os }}-mix-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ hashFiles('**/mix.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-mix-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-
+
+      - name: Restore PLT cache
+        uses: actions/cache@v4
+        with:
+          path: priv/plts
+          key: ${{ runner.os }}-plt-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ hashFiles('**/mix.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-plt-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-
+
       - name: Install dependencies
         run: mix deps.get